Mean velocity of particles ejected from various polycrystalline metal surfaces by sputtering with high energetic noble gas ions

Preliminary results of the measurements are presented. The mean velocity was determined in dependence on the ion energy and showed a characteristic decrease at a certain ion energyE _o which is in accordance with a proposition of Seitz on the influence of inelastic energy losses. Additional measurements were carried out using a thermocouple as an universal radiation detector and they showed a corresponding increase in radiation power at the same energy value.